淀粉基水凝胶St/CMC-g-PAA对Cu^(2+)的吸附性能研究  

Adsorption Properties of Cu^(2+)by Starch Based Hydrogel St/CMC-g-PAA

作　　者：李海花[1,2] 高玉华 郑玉轩[1] 李娜 张利辉 刘振法 LI Haihua;GAO Yuhua;ZHENG Yuxuan;LI Na;ZHANG Lihui;LIU Zhenfa(Institute of Energy Resources,Hebei Academy of Sciences;Hebei Engineering Research Center for Water Saving in Industry;Hebei Sunwater Water Treatment Co.,Ltd:Shijiazhuang 050081,China)

机构地区：[1]河北省科学院能源研究所 [2]河北省工业节水工程技术研究中心 [3]河北桑沃特水处理有限责任公司,河北石家庄050081

出　　处：《水处理技术》2024年第2期26-30,37,共6页Technology of Water Treatment

基　　金：河北省重点研发计划项目(21371201D);河北省科学院科技计划项目(23A09)。

摘　　要：以玉米淀粉(St)、羧甲基纤维素钠(CMC)为原料,丙烯酸(AA)为接枝单体,通过接枝和交联反应合成了淀粉基水凝胶St/CMC-g-PAA。考察了投药量、pH、Cu^(2+)初始浓度(ρ0)、吸附时间对吸附效果的影响。结果表明,当ρ0=40 mg/L,投药量为300 mg/L,pH=5.2时,Cu^(2+)的去除率可达92.7%。实验数据拟合结果表明,水凝胶对Cu^(2+)的吸附过程符合Langmuir吸附模型和准二级动力学模型,属于单分子层的化学吸附过程。在25℃时,水凝胶对Cu^(2+)的饱和吸附容量qm=142.86 mg/g。水凝胶再生性能较好,经过4次吸附-脱附循环后,Cu^(2+)去除率仍可达到82.1%。Starch-based hydrogel St/CMC-g-PAA was synthesized by grafting and crosslinking reaction with corn starch(St),sodium carboxymethyl cellulose(CMC)and acrylic acid(AA)as raw materials.The effects of dosage,pH value,initial concentration of Cu^(2+)(ρ0)and adsorption time on the adsorption were investigated.The results showed that whenρ0=40 mg/L,the dosage was 300 mg/L and pH=5.2,the removal rate of Cu^(2+)could reach 92.7%.The fitting results of experimental data showed that the adsorption process of Cu^(2+)by hydrogel was consistent with the Langmuir adsorption model and quasi-second-order kinetic model,and belonged to the chemical adsorption process of a single molecular layer.At 25℃,the saturated adsorption capacity qm=142.86 mg/g.The hydrogel had good regeneration performance.After 4 adsorption-desorption cycles,the removal rate of Cu^(2+)could still reach 82.1%.

关 键 词：淀粉 水凝胶 吸附 吸附机理 重金属离子 

分 类 号：TQ424[化学工程]